@david i find the solution
https://github.com/beganovich/snappdf/issues/27
this error 504 i think i solved by add my domain to hosts file.
hosted_ninja and phantom is work fine…but shappdf if i try to see 1 invoice says failed to load pdf, if i go to costumiza design of pdf show 500 error and if i try to open invoice in windows app show me Cannot raster a malformed pdf file
any ideas??
regards